Category

 

A	Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk
B	May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk
C	Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done
D	Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk
X	Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist
N A	Information not available